The figure shows the rate of change in the average monthly cell phone bill in a

Question

The figure shows the rate of change in the average monthly cell phone bill in a certain country between 1990 and 2008.

(a) Calculate the area of the region lying above the axis between the graph and the x-axis. (Round your answer to three decimal places.)
$  

(b) Calculate the total area of the regions lying below the axis between the graph and the x-axis. (Round your answer to three decimal places.)
$  

(c) Use the answers to parts (a) and (b) to estimate by how much the average monthly cell phone bill changed between 1990 and 2008. (Round your answer to three decimal places.)
$

Explanation / Answer

a)
Area = area of triangle
= 0.5*b*h
= 0.5*(15.48-8)*3.16
= 11.818 dollar
b)
Area = Area of rectangle + area of triangle
= L*B + 0.5*b*h
= (5.13*8) + 0.5*(18-15.48)*(1.03)
= 41.04 + 1.298
= 42.338 dollar

c)
Net decrease = 42.338 - 11.818
= 30.520 dollars
Answer: 30.520 dollars

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